Current-induced breakdown of the quantum anomalous Hall effect

Lippertz, Gertjan; Bliesener, Andrea; Uday, Anjana; Pereira, Lino M. C.; A., Taskin, A.; Ando, Yumiko

doi:10.48550/arxiv.2108.02081

Cited by 1 publication

(2 citation statements)

References 22 publications

(35 reference statements)

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“…The breakdown current for all devices is extracted in Fig 4b, and it scales linearly with the channel width. This supports the argument of electric-field driven breakdown of QAH [22], according to the equation:…”

Section: Resultssupporting

confidence: 87%

“…Noted that all the other data throughout the paper were acquired under either 0.5 nA or 1 nA AC excitation, which falls into this linear region. Above breakdown current I bd , the resistance begins to shoot up, as large current drives the system out of QAH states, which is attributed to the electric-field-driven percolation in the y-direction [22]. The breakdown current for all devices is extracted in Fig 4b, and it scales linearly with the channel width.…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Mesoscopic Transport of Quantum Anomalous Hall Effect in Sub-Micron Size Regime

Qiu,

Zhang,

Deng

et al. 2021

Preprint

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The quantum anomalous Hall (QAH) effect has been demonstrated in two-dimensional topological insulator systems incorporated with ferromagnetism. However, a comprehensive understanding of mesoscopic transport in sub-micron QAH devices has yet been established. Here we fabricated miniaturized QAH devices with channel widths down to 600 nm, where the QAH features are still preserved. A back-scattering channel is formed in narrow QAH devices through percolative hopping between 2D compressible puddles. Large resistance fluctuations are observed in narrow devices near the coercive field, which is associated with collective interference between intersecting paths along domain walls when the device geometry is smaller than the phase coherence length L φ . Through measurement of size-dependent breakdown current, we confirmed that the chiral edge states are confined at the physical boundary with its width on the order of Fermi wavelength.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 97%